Man the 800.2 IS a beast. That thing delivers. I have the 800a2 and it is awesome.
Great sounding bass, shake the ground sometimes:
I'd have to say 2 HE2's sealed or 1 HX2 ported. I had 2 HX2's sealed and I definitely got both, but I have no experience with the HE2's.
If you want great sound, you should look at sealed boxes. The Rockford 12s perform great in 1.25 cuft sealed boxes.
-Diabolik